I'am very new with z-wave protocl and the Z-Uno and i'am wondering if i can use the Z-Uno as a controler and 3 other Z-uno as activators.
Indeed, i whant to create this network :
1 z-uno controler -> z-uno activators1 with 3 relays
-> z-uno activators2 with 3 relays
-> z-uno activators3 with 3 relays

Z-Uno can't do the pairing procedure itself. It needs a z-wave controller for this: a z-wave controller controls the network, not one specifc device. Z-wave devices, like for example z-uno, can however make other z-wave devices do things, this is where the confusion starts: in normal live this is often called "controlling" that device. Z-uno can make other z-wave devices do things or respond to other device's commands, but it always requires a z-wave controller to create the network.